Fix spurious error in dispatch_io test.
Fix spurious error in dispatch_io test.

If /usr/share/dict/words was less than some arbitrary length, the test would fail.

nickhutchinson/libdispatch,PSPDFKit-labs/libdispatch,nickhutchinson/libdispatch,PSPDFKit-labs/libdispatch,evaautomation/libdispatch,SproutOrc/libdispatch,SproutOrc/libdispatch,SproutOrc/libdispatch,evaautomation/libdispatch,nickhutchinson/libdispatch,evaautomation/libdispatch,PSPDFKit-labs/libdispatch,SproutOrc/libdispatch,PSPDFKit-labs/libdispatch,evaautomation/libdispatch,nickhutchinson/libdispatch